CN100580459C - Current measurement apparatus - Google Patents
Current measurement apparatus Download PDFInfo
- Publication number
- CN100580459C CN100580459C CN200580013116A CN200580013116A CN100580459C CN 100580459 C CN100580459 C CN 100580459C CN 200580013116 A CN200580013116 A CN 200580013116A CN 200580013116 A CN200580013116 A CN 200580013116A CN 100580459 C CN100580459 C CN 100580459C
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- CN
- China
- Prior art keywords
- rogowski coil
- measure device
- current measure
- coil
- electric wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Electron Sources, Ion Sources (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The current measurement apparatus comprises a Rogowski coil (20) comprising a wire or conductor which forms a coil (22) and returns through the coil (22) as a central conductor. The coil (22) and the central conductor are formed from a single conductor or wire and, therefore, no electrical join (for example, a solder join or crimp) is required at the end of the Rogowski coil. The wire (28) used to form the coil (22) anal the central conductor (24) is insulated prior to forming the Rogowski coil. The insulated coating (30) provides better insulation between individual coils and also helps to provide a more even spacing between the coils.
Description
Technical field
The present invention relates to current measure device and a kind of measurement electric current, and be the method for measuring pulsating current or alternating current in particular.
Background technology
The eighties in 19th century, Chattock invented rogowski coil (Rogowski Coil) (Chattock A.P., magnetic potentiometer Philos magazine in 1887,94-96 page or leaf).This is the flexible solenoid with coaxial return conductors, and uses with by respond to the magnetic field that is produced by described conductor around current in the mode of non-insertion.The output of rogowski coil is derivative (derivative) or the proportional voltage of rate of change with measured electric current.Need provide this voltage output carrying out integration to produce the member of exporting with the proportional voltage of measured electric current.
Based on Ampere theorem, if length be 1, have N circle zone A, and the solenoid of pitch n=N/1 is vertically around current (with described conductor as the center, radius R=1/2 π), the magnetic field B of the center of each circle is by B=μ so
0I (t)/(2 π R) is given.Suppose A＜＜R
2, every circle magnetic flux is AB (t), this habitual equation that causes the output of rogowski coil be e (t)=-Nd (AB (t)/dt=-μ
0NAdi (t)/dt.
If coil layout is closed, rogowski coil only carries out integration to the rate of change of magnetic density B just so.
Define as Ampere theorem, any departing from of closed-loop path causes incomplete line integral therewith, and therefore causes the degraded accuracy of current measurement.
Because the measurement that the character of circuit closed Coupling Design leads to errors, so the present level of flexible rogowski coil technology trends towards using butt joint.Yet, also use other bond layout, for example, the right angle engages the peace row and engages.By twine the extra number of turn at the butt joint interface place, may improve degree of accuracy.
International Industry safety standard (Industrial International Safety Standards) (for example, IEC61010) the minimum creepage and clearance distance of regulation, this further makes the situation relevant with measurement performance worsen.
The electric wire that contains in the rogowski coil possesses insulating cover or coating usually.At safety standard (for example, the functional insulation of the security purpose of describing EN61010-1:2001 clause 6.9.1) comprises, following each thing can not be used as insulant for security purpose: (1) is easy to (for example damage, physical damage) material, for example, lacquer, enamel, oxide, anode film, (2) non-impregnated hygroscopic material (for example, preferably, electric wire possesses functional insulation for security purpose, and described in the preferred as suitable safety standard).
The objective of the invention is to overcome at least one problem related that this paper relates to or do not relate to prior art.
Summary of the invention
According to a first aspect of the invention, provide the current measure device that comprises rogowski coil, wherein rogowski coil is included in and forms the electric wire that rogowski coil is handled through insulation before.
Preferably, for security purpose, electric wire insulate.
Preferably, electric wire carries out insulation processing by insulating material.
Preferably, the anti-physical damage of insulating material.
Preferably, insulating material is not easy to damage, and preferably is not easy to physical damage.
Preferably, insulating material comprises resilient material.
For security purpose, the material of following type can be considered as inappropriate: a) material that can be easy to damage (for example, lacquer, enamel, oxide, anode film etc.); B) non-impregnated hygroscopic material (for example, paper, fiber, fibrous material etc.).
Preferably, the whole outer surface of electric wire is coated with insulating material, and described insulating material preferably provides insulation, and heavy insulation (being called insulation in this document) more preferably is provided.In particular, the outside surface of electric wire is handled through insulation, and is not only coated.
Preferably, insulating material comprises parcel electric wire or extruding electric wire.
Preferably, insulating material is not applied to electric wire (for example, lacquer).
Preferably, rogowski coil comprises single insulated line, and it provides center conductor and coil; And more preferably comprise single homogeneous insulated wire, it provides center conductor and coil.
Insulating coating can be less than 0.25mm, and preferably less than 0.175mm, and is more preferably less than or equals 0.125mm.
Preferably, by straight central conductor section being provided and forming rogowski coil around at least a portion winding around of described straight electric conductor section.Rogowski coil can comprise inner sheath (for example, dielectric sheath), and comprises that this sheath can be depending on the output characteristics requirement of rogowski coil.
Preferably, electric wire comprises copper cash.
Preferably, rogowski coil comprises end, and wherein said end does not need insulator cap.
Preferably, electric wire is along its whole length substantially and insulate.
Electric wire can comprise the plural layer insulating material.That electric wire can comprise is two-layer, three layers, or more multi-layered insulating material.
Preferably, rogowski coil comprises first terminal and second end.Preferably, during use, first end is through arranging that (during use) is to be positioned at the second terminal contiguous place.Preferably, during use, be positioned on first end first connector assembly through arrange (during use) with second connector assembly engagement that is positioned on second end.
Preferably, be positioned at first connector assembly on the end of rogowski coil through arranging that (during use) is to cooperate with second connector assembly on second end that is positioned at rogowski coil.
Preferably, during use, first end of rogowski coil is positioned at second connector assembly on second end of rogowski coil through arranging (during use) with location (or cooperation or engagement), thereby forms continuous loop or circumference.
Preferably, first end of rogowski coil is through arranging cooperating aspect the magnetic with second end of rogowski coil, and is preferably formed continuous loop or circumference.
Preferably, first connector assembly is positioned at first terminal the going up or first terminal and locate towards rogowski coil of rogowski coil, and second connector assembly is positioned at second terminal the going up or second terminal and locate towards rogowski coil of rogowski coil.
First connector assembly can comprise female component, and second connector assembly can comprise public assembly.Preferably, at least a portion of public assembly is on arranging that (during use) is with at least a portion that is positioned at female component.
First connector assembly can comprise magnet assembly.
Second connector assembly can comprise magnet assembly.
Second connector assembly can comprise metal.
Second connector assembly can comprise plate or smooth assembly.
Preferably, first connector assembly is through arranging that (during use) is only to be fixed to second connector assembly by magnetic force.
According to a second aspect of the invention, provide a kind of method that forms current measure device, it comprises with insulated line and forms rogowski coil.
Described method can comprise the formation central conductor section and use insulated line to form coil around central conductor section.
According to a third aspect of the invention we, provide a kind of method of measuring electric current, it comprises use current measure device according to a first aspect of the invention.
According to a forth aspect of the invention, provide a kind of method of measuring electric current, it comprises the current measure device that use forms according to a third aspect of the invention we.
Description of drawings
Now will only referring to the following drawings the present invention be described by way of example, in the accompanying drawing:
Fig. 1 is the skeleton view of the part of prior art rogowski coil.
Fig. 2 is the skeleton view of a part of end that comprises the prior art rogowski coil of end cap.
Fig. 3 is the skeleton view according to the part of the preferred embodiment of rogowski coil of the present invention.
Fig. 4 is the skeleton view of a part of preferred embodiment of insulated line that is used for the preferred embodiment of rogowski coil.
The skeleton view of the preferred embodiment of rogowski coil when Fig. 5 is to use.
Fig. 6 is first end of prior art rogowski coil and the side xsect of second end.
Fig. 7 is the side view of the preferred embodiment of first terminal and second end of rogowski coil before using.
The side view of the preferred embodiment of first of the rogowski coil end and second end when Fig. 8 is to use.
Embodiment
As shown in Figure 3, the preferred embodiment of current measure device comprises the rogowski coil 20 that contains live wire or conductor, and described electric wire or conductor form coil 22 and return as center conductor 24 by coil 22.Coil 22 and center conductor 24 are formed by single conductor or electric wire, and therefore the end of rogowski coil 20 does not need electricity to engage (for example, solder joints or bending).Need this type of joint in the prior art rogowski coil.
The electric wire 28 that is used for forming coil 22 and center conductor 24 was handled through insulation before forming rogowski coil 20, as shown in Figure 4.Insulant 30 or insulator-coating electric wire with aequum.Electric wire not only is coated with coating material, because necessary insulation characterisitic can be provided like this.Insulating coating 30 on the electric wire is providing good insulation between the coil separately, and with respect to insulating sheath or sleeve pipe are provided, also helps to provide between the online circle more uniform interval.Electric wire is copper, and its outside surface is applied fully along its length.Yet the end of electric wire makes electric wire can be electrically connected to measuring equipment measuring the induction current in the rogowski coil, and the therefore electric current in the calculating conductor 32.
For the purpose of the security purpose of describing in the safety standard (for example, EN61010-1:2001 6.9.1 bar), cover electric wire with functional insulating material.This standard is got rid of for security purpose following each thing as insulant: the hygroscopic material (for example, paper, fibrous material) that the material that (1) is easy to damage (for example, lacquer, enamel, oxide, anode film) and (2) are non-impregnated.Therefore, insulating material comprises resilient material to prevent or to suppress its physical damage at least.In addition, insulating material comprises waterproof material.
Electric wire is by plural layer insulator-coating or covering, and comprises in a preferred embodiment with the insulating material of three concentric layers triple insulating material around electric wire.In particular, insulating material of the present invention is wrapped or pushes, rather than with the lacquer the same use.
Coil end will only need to be protected to exempt from the physics infringement and/or to damage.The coil end of prior art rogowski coil needs insulator cap 11 that the end of rogowski coil is insulated, as shown in Figure 2.Coil 22 of the present invention and center conductor 24 have the electric safety curtain of the nature that is built in the structure.In addition, in the coil that the electric wire that uses pre insulated forms, will there be other protection requirement except the physics infringement and/or damaging.
Preferred embodiment provides 600V ratings under the situation of triple insulated lines.Insulating coating 30 in the copper cash 28 is equal to or less than 0.125mm substantially.
That is to say that the radial thickness of insulant is equal to or less than 0.125mm.For high voltage, insulating coating can be thicker.Dielectric breakdown voltage will or conform with required voltage ratio greater than 1kV.
Insulated in advance owing to form the electric wire of coil 22 and straight conductor segment 24, so the physical dimension of rogowski coil through minimizing, and does not need end cap that insulation is provided.Prior art rogowski coil volume is huger relatively, because it comprises interior dielectric sheath 12 and oversheath 14, or enough thick in can prevent the big envelope of power backup safety and physics infringement.During use, rogowski coil 20 is positioned at around the electric conductor 32 so that rogowski coil is measured the electric current in the electric conductor 32, as shown in Figure 5.
Rogowski coil provided by the invention is less, insulativity is better, and does not need to be used for inherently safe terminal insulator cap.
The present invention can comprise interior dielectric sheath, and the use of this sheath can provide good insulation.The use of this sheath can be depending on the output characteristics of rogowski coil.
Note that combine with the application's case with this instructions simultaneously or All Files and the document before this instructions, submitted, it opens to the public with this instructions, and the content of all these files and document is incorporated herein by reference.All features that (comprise any accessory claim, summary and accompanying drawing) in this instructions and disclosed, and/or the institute of any method that so discloses or process can any array mode make up in steps, but except at least some the mutually exclusive array modes in these features and/or the step.
Unless clear and definite regulation in addition, each feature that (comprises any accessory claim, summary and accompanying drawing) in this instructions and disclose can be identical by reaching, the alternative features of equivalence or similar purpose replaces.Therefore, unless clearly stipulate in addition, each feature that is disclosed only is general a series of equivalences or an example of similar characteristics.
The invention is not restricted to the details of previous embodiment.The present invention extends to the combination of any novelty of any one novel feature of the feature that (comprises any accessory claim, summary and accompanying drawing) in this instructions and disclose or feature, perhaps extends to the combination of any novelty of any one novel step of step of any method of announcement like this or process or step.
Claims (15)
1. current measure device that comprises rogowski coil, wherein said rogowski coil are included in and form the single insulated line of handling through the insulation insulated with material before the rogowski coil that center conductor and coil are provided.
2. current measure device according to claim 1, wherein said electric wire comprises the insulating coating of 0.125mm.
3. current measure device according to claim 1, wherein said rogowski coil are by straight central conductor section being provided and forming around at least a portion winding around of described straight central conductor section.
4. current measure device according to claim 1, wherein said insulating material be can anti-physical damage insulating material.
5. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said insulating material comprises the wrap member that is used for described electric wire.
6. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said insulating material comprises the extrusion that is used for described electric wire.
7. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said rogowski coil comprises inner sheath.
8. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said electric wire comprises copper cash.
9. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said rogowski coil comprises end, and wherein said end does not need insulator cap.
10. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said electric wire comprises the plural layer insulating material.
11. according to the described current measure device of the arbitrary claim of claim 1-4, wherein said rogowski coil comprises first terminal and second end.
12. current measure device according to claim 11, wherein in use, described first end is in use through arranging to be positioned at the described second terminal contiguous place.
14. a method that forms current measure device, it comprises with insulated line and forms rogowski coil, and described insulated line provides the center conductor of rogowski coil and the single electric wire of coil.
15. method according to claim 14, wherein said method comprise the formation central conductor section and use insulated line to form coil around described central conductor section.
16. a method of measuring electric current, it comprises use according to the described current measure device of arbitrary claim in the claim 1 to 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0409549.3A GB0409549D0 (en) | 2004-04-29 | 2004-04-29 | Current measurement apparatus |
| GB0409549.3 | 2004-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101023364A CN101023364A (en) | 2007-08-22 |
| CN100580459C true CN100580459C (en) | 2010-01-13 |
Family
ID=32408228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580013116A Active CN100580459C (en) | 2004-04-29 | 2005-03-29 | Current measurement apparatus |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7746059B2 (en) |
| EP (1) | EP1740960B1 (en) |
| CN (1) | CN100580459C (en) |
| AT (1) | ATE381023T1 (en) |
| CA (1) | CA2564181A1 (en) |
| DE (1) | DE602005003815T2 (en) |
| GB (2) | GB0409549D0 (en) |
| WO (1) | WO2005106507A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7003435B2 (en) | 2002-10-03 | 2006-02-21 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
| US8987808B2 (en) | 2006-03-29 | 2015-03-24 | Cambridge Enterprise Limited | Thin film transistor with accurately aligned electrode patterns and electronic device(s) that include same |
| CN101910856B (en) | 2008-01-29 | 2014-06-18 | 立维腾制造有限公司 | Self testing fault circuit interrupter apparatus and method |
| US7876086B2 (en) * | 2008-02-28 | 2011-01-25 | International Components Corporation | Current measuring device for measuring the electrical current flowing in an electrical conductor electrically isolated from the current measuring device |
| US8193818B2 (en) * | 2009-01-15 | 2012-06-05 | Hamilton Sundstrand Corporation | Partial corona discharge detection |
| US9151782B2 (en) * | 2009-07-31 | 2015-10-06 | Pulse Electronics, Inc. | Current sensing devices and methods |
| US9823274B2 (en) * | 2009-07-31 | 2017-11-21 | Pulse Electronics, Inc. | Current sensing inductive devices |
| US9664711B2 (en) * | 2009-07-31 | 2017-05-30 | Pulse Electronics, Inc. | Current sensing devices and methods |
| CN101968515B (en) * | 2010-11-03 | 2014-05-14 | 天津市特变电工变压器有限公司 | Fast detection device of transformer core loss and turns of coils and detection method thereof |
| US8599523B1 (en) | 2011-07-29 | 2013-12-03 | Leviton Manufacturing Company, Inc. | Arc fault circuit interrupter |
| US8912807B2 (en) * | 2011-09-09 | 2014-12-16 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US9304149B2 (en) | 2012-05-31 | 2016-04-05 | Pulse Electronics, Inc. | Current sensing devices and methods |
| US20140125446A1 (en) | 2012-11-07 | 2014-05-08 | Pulse Electronics, Inc. | Substrate inductive device methods and apparatus |
| US9759758B2 (en) | 2014-04-25 | 2017-09-12 | Leviton Manufacturing Co., Inc. | Ground fault detector |
| JP7206803B2 (en) * | 2018-10-26 | 2023-01-18 | スミダコーポレーション株式会社 | Coil wire, current sensor material and current sensor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE515388C2 (en) * | 1995-09-14 | 2001-07-23 | Abb Research Ltd | Device for sensing electrical discharges in a sample object |
| JP3773537B2 (en) * | 1995-11-14 | 2006-05-10 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Coaxial cable for magnetic resonance equipment |
| DE19640981A1 (en) * | 1996-10-04 | 1998-04-16 | Asea Brown Boveri | Rogowski coil |
| US6313623B1 (en) * | 2000-02-03 | 2001-11-06 | Mcgraw-Edison Company | High precision rogowski coil |
| US6559651B1 (en) * | 2000-10-25 | 2003-05-06 | Robert G. Crick | Method for locating an open in a conductive line of an insulated conductor |
| EP1653482B1 (en) | 2001-06-01 | 2009-01-21 | The Furukawa Electric Co., Ltd. | Multilayer insulated wire and transformer using the same |
| JP4332623B2 (en) * | 2003-02-26 | 2009-09-16 | テクトロニクス・インコーポレイテッド | Current probe |
| US7227441B2 (en) * | 2005-02-04 | 2007-06-05 | Schweitzer Engineering Laboratories, Inc. | Precision Rogowski coil and method for manufacturing same |
| US7638999B2 (en) * | 2006-04-07 | 2009-12-29 | Cooper Technologies Company | Protective relay device, system and methods for Rogowski coil sensors |
-
2004
- 2004-04-29 GB GBGB0409549.3A patent/GB0409549D0/en not_active Ceased
-
2005
- 2005-03-29 GB GB0618355A patent/GB2429303B/en active Active
- 2005-03-29 CA CA002564181A patent/CA2564181A1/en not_active Abandoned
- 2005-03-29 EP EP05732542A patent/EP1740960B1/en active Active
- 2005-03-29 WO PCT/GB2005/001226 patent/WO2005106507A1/en active IP Right Grant
- 2005-03-29 US US10/599,843 patent/US7746059B2/en active Active
- 2005-03-29 DE DE602005003815T patent/DE602005003815T2/en active Active
- 2005-03-29 CN CN200580013116A patent/CN100580459C/en active Active
- 2005-03-29 AT AT05732542T patent/ATE381023T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE602005003815D1 (en) | 2008-01-24 |
| GB2429303B (en) | 2007-09-19 |
| CA2564181A1 (en) | 2005-11-10 |
| GB2429303A (en) | 2007-02-21 |
| GB0409549D0 (en) | 2004-06-02 |
| CN101023364A (en) | 2007-08-22 |
| US7746059B2 (en) | 2010-06-29 |
| GB0618355D0 (en) | 2006-10-25 |
| EP1740960A1 (en) | 2007-01-10 |
| WO2005106507A1 (en) | 2005-11-10 |
| US20070210787A1 (en) | 2007-09-13 |
| EP1740960B1 (en) | 2007-12-12 |
| DE602005003815T2 (en) | 2008-12-04 |
| ATE381023T1 (en) | 2007-12-15 |
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